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(No Model.) 8 2 Sheets$heet 1.

. I O. H. GARY.

RBVERSING ATTACHMENT FOR ROTARY ENGINES 0R PUMPS. N0.-392,260.. Patented Nov. 6 1888. I

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(No Model.) 2 Sheets-Sheet 2.

T O. H. GARY. REVERSING ATTACHMENT FOR ROTARY ENGINES 0R PUMTS. No. 392,260. Patented Nov. 6, 1888.

UNITED STATES PATENT f Trice.

CHARLES H. CARY, OF BRISTOL, RHODE ISLAND.

REVE RSING ATTACHMENT FOR ROTARY ENGINES OR PUMPS.

SPECIFICATION forming part of Letters Patent No. 392,260, dated November 6, 1888.

Application filed September 21, 1881. Serial No. 250,363. (No model.)

tol, in the county of Bristol and State of Rhode- Island, have invented a new and useful Improved Reversing Attachment for Rotary Engines or Pumps, of which the following is a specification.

My invention relates to that class of rotary engines or pumps which are provided with reciprocating pistons operating within radial piston chambers formed in a rotary head which revolves withina case.

The object of my invention is to provide convenient means for causing the opposite revolution of the rotary head and shaft conjointly with thepassage of the fluid in anniform direction through the ports and passages of the machine, the same machine being adapted for use as esteem-condenser air-pu mp or a motive engine; and my improvement consists in making the eccentric by means of which the pistons are caused to reciprocate adjustable to opposite sides of the axis of the machine, as hereinafter fully set forth.

Figure l is a vertical axial section of a rotary pump provided with my improvement. Fig. 2 is a vertical transverse section of the same. Fig. 3 represents a section taken in the line :0 w of Fig. 1. Fig. at is a detail top View showing the outer end of the hub of the removable head of the case, the hand-lever for operating the eccentric, and the stop-shoulders, which serve to limit the reversal movement of the eccentric to about one hundred and eighty degrees. Fig. 5 is a vertical transverse section showing a modification which is adapted for use either as an engine or pump, and to which my improvement is applied. Fig. 6 is a vertical axial section of the same, the operating-handle being set in a vertical position to show the engaging-spur.

In the accompanying drawings, A, Fig. 1, is the outer case of a rotary pump.

B is the rotary head, which is provided diametrically with a chamber, a, in which is placed the double-faced piston O, which is adapted to draw the fluid into a portion of the chamber a and to eject it therefrom upon the proper rotation of the piston-head B. The piston O is provided with a centrally-arranged slot, b,

which is adapted to receive the eccentric D, by means of which the piston G will be reciprocated during the revolution of the head B. The eccentric D is provided with a stem, 0, which is made hollow to receive the shaft E of the pump, and is loosely held in the hub d of the removable head e of the case. The hub dis cut away at the upper side of its outer end, as shown in the sections, Figs. 1 and 3,

'to form the stop-shoulders h h, and upon the end of-the stem 0 of the eccentric D is secured the handle F, by means of which the said eccentric can be reversed or thrown to the opposite side of the axis of the pump. The attaching-collarf of the handle F is provided with an inwardly-projecting spur, g, which, upon the reversal of the eccentric by movement through an arc of one hundred and eighty degrees, will rest upon the shoulders hh, respect ively.

The rotary piston-head B is keyed to the shaft E at the hub i, and upon the rotation of the said shaft in the direction indicated by the arrow shown in Fig. 2 the fluid will be drawn upward through the check'-valve r in the suction pipe or passage j and ejected from the outlet k, and upon the reversal of the movement of the shaft the resulting pressure of the fluid between the face of the piston G and the closed check-valve r will cause the reversal of the eccentric D, the spur 9 moving over to the opposite stop-shoulder h, and thereupon the fluid will pass upward at the opposite side of the pump and be ejected, as before.

The reversal of the eccentric will in this case be produced directly from the changed rotation of the shaft E, thus adapting the pump for use on board of steamers, in which it is often necessary to reverse the movement of the driving-engine, which also operates the air-pump of the steam-condenser to which my improvement has been successfully applied. The eccentric D can, however, be at any time operated by hand by means of the attached lever or handle F.

A form of construction which is also adapted for a rotary engine is shown in Figs. 5 and 6, in which A is the outer case, to the opposite sides of which are secured the removable heads B B". The removable head B is provided with a central hub, a, adapted to form a bear ing for the shaft and the removable head B is provided with an outwardly-dircctcd huh, I), which is also cut away to form the stop -shouldcrs h h for the spur g, as

shown in Fig. 3. The revolving piston-head D is firmly secured to the shaft 0 by means of the inwardly-directed hub 12, and the piston-chambers c c c are made to extend radially from the periphery of the rotary head to to the central chamber, 0, of the same. The ro tary head D is also made to have a bearing upon the periphery of the disk f,to the stem of which the handle F is attached. -Within the radial chambers c c c are placed the pistons E E" E, recessed at their backs in order to receive the outer ends of the connectingrods i 2 i, which are pivoted to the said pis ions by means of the pins 5 The innercnds of the conncetingrods 'iare loosely held upon the eccentric j, which extends inward from the side of the disk f. The case A is provided with the openings 7; and Z, and also with the curved passages or chambers in a, which extend on opposite sides between the abutments G G. Whenever a fluid under pressure is admitted to the chamber or pas sage at through the opening 7.1, the resulting pressure upon the face of the highest piston Efloperating obliquely against the ccccntricj,

0 which is held stationary by means of the spur which rests against one of the stop-shoulders /L, as shown in Fi 3, will cause the pistonhead .l) to revolve in the direction of the arrow in Fig. 5, and the fluid passing into the chamber 0 will exhaust through the opening 5, and the natural tendency of the pressure exerted upon the eccentric will serve to hold it in the set position without the employment of a locking catch, and upon the subsequent movement of the handle F through an arc of one hundred and eighty degrees, so that the spur 1 will be caused to rest against the opposite stop-shoalder h, the pressure then exerted upon the piston will cause the rotation of the piston-head in the opposite direction, the said pressure,as before, tending to hold the eccentric in position by pressing the spur 9 against the stopshoulder It. When employed as a pump,a check-valve may be placed in the opening Z, and upon the reversal of the movement of the shaft 0 the eccentric j will be moved to its proper position to continue the flow of the fluid through the pump in the same direction as before; but under ordinary conditions the cheek-valve can be omitted without impairing the action of the machine, the inertia of the water and friction of the machine being sufficicnt to change the position of the eccentric as required.

I claim as my invention- 1. The combination, with the outer ease, the rotary pistoirhcad, the reciprocating pistons, and the check-valve, of the eccentric operativel y connected with the pistons and adapted for adjustment upon the reversed rotation of the pistonhead, substantially as described.

2; The combination, with the outer case, the rotary piston-head, and the reciprocating pistons, of the adjustable eccentric opcratively connected with the pistons, and means for holding the eccentric in its opposite position, substantially as described.

3. The combination, with the outer case, the rotary piston-head, and the reciprocating pistons, of the eccentric opcrativcly connected with the pistons and loosely held for reversing movement between opposite stopshonldcrs,

substantially as described.

4. The combination, with the outer case, the rotary piston-head, and the reciprocating pistons, of the adjustable eccentric opcratively connected with the pistons, the stop-shoulders, the engaging-spur, and the handle, substantially as described.

CHARLES ll. CARY.

Witnesses:

JOHN S. LYNen, Soenyrns Senormnrn. 

